How much does a 1.50 to 1.99ct I IF natural radiant diamond cost?

As of October 2026, 1.50 to 1.99ct I IF natural radiant diamonds typically cost £3,548 GBP to £7,664 GBP, with a median price of £5,735 GBP. There are currently 11 diamonds matching this specification available across retailers.

Where can I find the best price on a I IF radiant diamond?

About 41% of these diamonds are available at multiple retailers, with an average price spread of 60%. A comparison tool like Carat Hunter lets you see all the prices side by side.

1.50 to 1.99ct I IF Natural Radiant

Quick answer

As of October 2026, there are 11 natural radiant diamonds with I colour and IF clarity in the 1.50 to 1.99ct range available across retailers worldwide. Prices typically run £3,548 GBP to £7,664 GBP, with a median of £5,735 GBP. At least 40 retailers stock this exact specification, and 41% of the stones appear at more than one of them, with an average price spread of 60%. Half of all listings fall between £2,690 GBP and £4,869 GBP per carat. The same specification in lab grown form lists at a median of about £302 GBP per carat. Over the last 30 days the median price moved -0.9% and the number of listings moved +51.7%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Radiant natural stones in the index: 3,091 USD per carat, +13.2% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

Lowest Price

£2,543 GBP

Highest Price

£12,480 GBP

Average Price

£5,561 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

41.2%

Price Spread

60.0%

30-Day Price Trend

-0.9%

30-Day Supply Change

+51.7%

Volatility (30d)

0.01

Price Range

Price per carat distribution across retailers

$4,834/ct

10th Percentile

$2,915

Median

$4,834

90th Percentile

$8,014

Score Distribution

24 diamonds scored across 4 quality tiers

Excellent

9 (37.5%)

Very Good

5 (20.8%)

Good

6 (25.0%)

Average

4 (16.7%)

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Consider Instead

Save money without compromising on what matters. These alternatives are visually similar but cost less.

J IFJ colour is visually identical to I to the naked eye

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Lab-Grown I IFSame specifications, lab-grown origin

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1